Respiratory mask



FIG. 1 is a perspective view showing the new design for a respiratory mask design.

FIG. 2 is a front view thereof.

FIG. 3 is a top elevational view thereof.

FIG. 4 is a bottom elevational view thereof.

FIG. 5 is a rear elevational view; and,

FIG. 6 is a side elevational view. The left side elevational view is the same as the right side elevational view.

The broken lines showing in FIGS. 1-6 are for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a respiratory mask, as shown and described. 